Q: 1 Which of the following is not an OSI layer?
A. Data link Layer.
B. Physical Layer.
C. TCP/IP.
D. None of the above.
Q: 2 IEEE stands for:
A. Institute of Electrical & Electronic Engineers.
B. Institute of Electronic & Electrical Engineers.
C. Indian Electronic & Electrical Engineers.
D. None of the above.
Q: 3 OSI is an abbreviation of:
A. Open Synchronization Institute.
B. Open Synchronization Interface.
C. Other Synchronization Interconnections.
D. Open Synchronization Interconnections.
Q: 4 Which agency created standards for telephone communications (V Series) and for network interfaces and public networks (X Series)?
A. ATT
B. ITU-T
C. ANSI
D. ISO
Q: 5 ____________ are the rules that govern a communication exchange.
A. Media
B. Criteria
C. Protocols
D. All of the above.
Q: 6 Television broadcast is an example of ________________ transmission.
A. Simplex
B. Half-Duplex
C. Full-Duplex
D. Automatic
Q: 7 The _______________ layer is the layer closest to the transmission medium.
A. Physical
B. Data link
C. Network
D. Transport
Q: 8 Decryption and Encryption of data are the responsibility of the _________ layer.
A. Physical
B. Data link
C. Presentation
D. Session
Q: 9 Dialog Control is a function of the ________________ layer.
A. Physical
B. Data link
C. Presentation
D. Session
Q: 10 Node to Node delivery of the data unit is the responsibility of the ______________ layer.
A. Physical
B. Data link
C. Presentation
D. Session
Q: 11 The ___________ layer lies between the network layer and the session layer.
A. Physical
B. Data link
C. Transport
D. Application
Q: 12 In the _______________ layer, the data unit is called a frame.
A. Physical
B. Data link
C. Presentation
D. Session
Q: 13 The OSI model consists of _________ layers.
A. 3
B. 5
C. 7
D. 9
Q: 14 Which of the following is an Application Layer service?
A. Network Virtual Terminal
B. File transfer, access, and management
C. Mail service
D. All of the above.
Q: 15 The physical layer is concerned with the transmission of _______________ over the physical medium.
A. Programs
B. Dialogs
C. Protocols.
D. Bits
Q: 16 A sine wave is _______________________
A. Periodic & Continuous
B. Aperiodic & Continuous
C. Periodic & Discrete
D. Aperiodic & Discrete
Q: 17 Before information can be transmitted, it must be transformed into _____________
A. Periodic Signals
B. Electromagnetic Signals
C. Aperiodic Signals
D. Low frequency sine waves
Q: 18 AM & FM are the examples of _________________ modulation.
A. Digital-to-analog
B. Digital-to-digital
C. Analog-to-digital
D. Analog-to-analog
Q: 19 ASK, PSK, FSK & QAM are the examples of ___________________ modulation.
A. Digital-to-analog
B. Digital-to-digital
C. Analog-to-digital
D. Analog-to-analog
Q: 20 Unipolar, bipolar & polar encoding are the examples of __________ encoding.
A. Digital-to-analog
B. Digital-to-digital
C. Analog-to-digital
D. Analog-to-analog
Q: 21 PCM is an example of ______________ conversion.
A. Digital-to-analog
B. Digital-to-digital
C. Analog-to-digital
D. Analog-to-analog
Q:22 The Nyquist theorem specifies the minimum sampling rate to be __________.
A. Equal to the lowest frequency of a signal.
B. Equal to the highest frequency of a signal.
C. Twice the bandwidth of a signal.
D. Twice the highest frequency of a signal.
Q: 23 In _____________ transmission, bits are transmitted over a single wire, one at a time.
A. Asynchronous serial.
B. Synchronous serial.
C. Parallel serial.
D. Both a & b.
Q: 24 Synchronization transmission doesn’t have ____________________.
A. A start bit.
B. A stop bit.
C. Gaps between bytes.
D. All of the above.
Q: 25 A _____________ is a device that is a source of or destination for binary digital data.
A. Data Terminal Equipment
B. Data Transmission Equipment
C. Digital Transmission Equipment
D. Digital Terminal Equipment
Q: 26 A _______________ is a device that transmits or receives data in the form of an analog or digital signal through a network.
A. Data Connecting Equipment
B. Data Circuit-terminating Equipment
C. Data Converting Equipment
D. Data Communication Equipment
Q: 27 The EIA-232 interface has ______ pins
A. 20
B. 24
C. 25
D. 30
Q: 28 A modem is a ______________ that modulates and demodulates signals.
A. Data Terminal Equipment
B. Data Transmission Equipment
C. Data Connecting Equipment
D. Data Circuit-terminating Equipment
Q: 29 Which of the following modulation techniques are used by modems?
A. 16-QAM
B. FSK
C. 8-PSK
D. All of the above.
Q: 30 Transmission media are usually categorized as _________________
A. Fixed or unfixed
B. Guided or unguided
C. Determinate or undeterminate
D. Metallic or non metallic
Q: 31 _________ cable consists of an inner copper core and a second conducting outer sheath.
A. Twisted pair
B. Coaxial
C. Fiber-optic
D. Shielded twisted pair
Q: 32 In fiber-optics, the signal source __________ waves.
A. Light
B. Radio
C. Infrared
D. Very low frequency
Q: 33 Which of the following is not a guided medium?
A. Twisted pair cable
B. Coaxial cable
C. Fiber-optic.
D. Atmosphere
Q: 34 In cellular telephony, a service area is divided into small regions called _________
A. Cells
B. Cell Offices
C. MTSOs
D. Relay sites
Q: 35 In cellular telephony, the size of a cell depends on ____________
A. The area terrain
B. The area population
C. The number of MTSOs
D. All of the above.
Q: 36 In cellular telephony, the MTSO is responsible for __________________
A. Connecting the cell with the telephone central office.
B. Assigning channels for transmission.
C. Billing functions
D. All of the above.
Q: 37 ____________ is a type of transmission impairement in which an outside source such as crosstalk corrupts a signal.
A. Attenuation
B. Distortion
C. Noise
D. Decibel
Q: 38 ____________ is a type of transmission impairement in which the signal loses strength due to the resistance of the transmission medium.
A. Attenuation
B. Distortion
C. Noise
D. Decibel
Q: 39 _______________ is due to the different proportion speed of each frequency that makes up the signal.
A. Attenuation
B. Distortion
C. Noise
D. Decibel
Q: 40 The performance of transmission media can be measured by ________
A. Throughput
B. Propogation speed
C. Propogation time
D. All of the above
Q: 41 The sharing of a medium and its path by two or more devices is called _________
A. Modulation
B. Encoding
C. Line discipline
D. Multiplexing
Q: 42 Which multiplexing technique transmits analog signals?
A. FDM
B. Synchronous TDM
C. Asynchronous TDM
D. B & C.
Q: 43 Which multiplexing technique involves signal composed of light beams?
A. Synchronous TDM
B. Asynchronous TDM
C. WDM
D. TDM
Q: 44 ______________ theorem says that the sampling rate must be at least twice the highest frequency component in the original signal.
A. Shannon
B. Newton
C. Nyquist
D. None of the above
Q: 45 _________________ involves sampling, quantizing each sample to a set of number of bits and then assign voltage levels to the bits.
A. QAM
B. PSK
C. PCM
D. ASK
Q: 46 ___________ & ________ are the terms used to describe digital signal
A. Bit rate & bit interval
B. Sine wave & bit interval
C. Sine wave & bit rate
D. None of the above
Q: 47 The _______________ of a signal is the range of frequencies the signal occupies.
A. Amplitude
B. Sine wave
C. Bandwidth
D. Frequency
Q: 48 _________ layers enables the users to access the network.
A. Physical
B. Network
C. Application
D. Presentation
Q: 49 ___________ layers are the network support layers.
A. Physical
B. Data link
C. Network
D. All of the above
Q: 50 ______________ breaks data into frames and assigns sequence numbers.
A. Network
B. Data link
C. Transport
D. Session